Sperm whale (Physeter macrocephalus) in "head-out" position. This vertical position is used in socialising and when approached by a vessel, may provide a better 3D vision of an object. Endangered, Ionian Sea, Greece.

mammal cetacean sperm whale whales physeter macrocephalus head out position head surfacing vertical position socialising one animal lone single surfacing scarring behaviour communication ionian sea water